FIELD: thermal engineering. SUBSTANCE: liquid or gaseous fuel or fuel mixture is pre-burned in heat-insulated volume in secondary-air flow and exit gases are delivered to mixing section 3 which is supplied at the same time with solid-fuel dust-air mixture. Dust-air mixture and combustion products heated to 500-600 C are fully mixed up in mixing section 3 and passed to boiler burner 2 for complete combustion. EFFECT: provision for combined combustion of solid, liquid, and gaseous fuels in thermal power plant boilers. 4 dwg
